Toroid yoke with multi-part core

ABSTRACT

A cathode ray tube deflection yoke includes horizontal and vertical deflection windings toroidally wrapped about a multipart core having a circular flared portion and a quasicylindrical portion affixed thereto and formed to telescope over the neck portion of a cathode ray tube.

" [75] Inventor:

[221' Filed:

United States Patent [191 Torsch TOROID YOKE WITH MULTl-PART CORECharles Edward Torsch, Geneva, NY.

.73 Assignee: GTE Sylvania Incorporated Sept. 8, 1971 [21 Appl.No.:178,752

[52] U.S. Cl ..335/2l0, 335/2l3 [51] Int. Cl ..H0lf 7/00 [58] Field ofSearch ..335/2l0, 2l3, 297; 313/75 [56] References Cited UNIT-ED STATESPATENTS 3,634,79 1 1973 Nakano ..335/2|3 x Jan. 16, 1973 2,821,6711/1958 Kratz et al ..335/213 l/l972 Tsutsumi ..335/2l3 FOREIGN PATENTSOR APPLICATIONS 2,025,146 1/1971 Germany ..335/2l0 PrimaryExaminer-George l-larris Attorney-Norman J. OMalley et al.

[57] ABSTRACT A cathode ray tube deflection yoke includes horizontal andvertical deflection windings toroidally wrapped about a multi-part corehaving a circular flared portion and a quasi-cylindrical portion affixedthereto and formed to telescope over the neck portion of a cathode raytube.

l0.Claims, 2 Drawing Figures PATENTEUJM 16 1915 3.71 1, 802

NVENTOR.

I CHARLES E. TORSCH lQ- 1 BY M 5. W

ATTORNEY TOROID YOKE WITH MULTI-PART CORE BACKGROUND OF THE INVENTIONGenerally, toroid-wound deflection yokes include a core of magneticmaterial whereon the windings are disposed. This core is usuallysubstantially circular in shape and includes a central opening formed totelescope over the neck portion of a cathode ray tube. Moreover, thecore normally includes a flared portion formed to substantially conformto the flared portion of the cathode ray tube.

Although the above-described deflection yoke configurations have beenand still are suitable for many applications, it has been found thatthere are other applications wherein such configurations leave somethingto be desired. For example, the advent of the so-called 1 cathode raytube resulted in a flared portion with A OBJECTS AND SUMMARY OF THEINVENTION Therefore, it is an object of the present invention to providean enhanced deflection yoke suitable for use with a cathode ray tube.Another object of the invention is to provide an improved deflectionyoke having enhanced electrical capabilities. Still another object ofthe invention is to improve the core configuration of a toroid-wounddeflection yoke. A further object of the invention is to provide animproved deflection yok having a two-part core configuration.

These and other objects, advantages and capabilities are achieved in oneaspect of the invention by a toroidwound deflection yoke having alongitudinal axis and a two-part core member with a flared portion and aquasi-cylindrical portion formed for attachment therebetween andtelescopic relationship with the neck portionof a cathode ray tube.

BRIEF DESCRIPTION OF THE DRAWINGS with the above-described drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings, FIG.1 illustrates toroidwound deflection yoke having a two-part core member5 with a flared portion 7 and a quasi-cylindrical portion 9. The flaredportion 7 has a first notched plastic member 11 affixed thereto and thequasi-cylindrical portion 9 has a second notched plastic member 13attached thereto. A plurality of wire turns 15 inthe form of horizontaland vertical deflection windings are toroidally wrapped about the coremember 5 and first and second plastic members, 11 and 13 respectively,to provide a toroid-wound deflection yoke.

More specifically, the exploded view of FIG. 2 illustrates the two-partcore member 5 having a substantially circular flared portion 7 andquasi-cylindrical portion 9. The flared portion 7 has a frontward edgeportion 17 which includes a plurality of spaced notches 19 disposed onthe horizontal and vertical axes. Moreover, the flared portion 7 isrelatively thick as compared to the quasi-cylindrical portion 9 andcontoured for contacting relationship on the interior surface 21 withthe wire turns 15 and the flared portion of a cathode ray tube.

A first plastic member 11 includes a plurality of wire receiving slots23 and pairs of forward, outward, and rearward extending ear members 25disposed on the horizontal and vertical axes. The ear members 25 arespaced and formed for reception by the spaced notches 19 of the flaredportion 7 while the slots 23 are formed to receive the wire turns 15.

The quasi-cylindrical portion 9 includes a frontward edge portion 27having a plurality of indentations 29 circumferentially spaced anddisposed on the horizontal and vertical axes. Also, a plurality ofinwardly ex-- tending protuberances 31 are disposed on the horizontaland vertical axes and in longitudinal alignment with the indentations29. Moreover, a second plastic member 13 includes a plurality of grooves33 formed to receive the wire turns 15 and circumferentially spaced tabs35 disposed on the horizontal and vertical axes. This plastic member 13is also formed for attachment to the quasi-cylindrical portion 9.

In assembly, the spaced notches 19 of the flared portion 7 arelongitudinally aligned with the indentations 29 of the quasi-cylindricalportion 9. Thereupon, the flared portion 7 and quasi-cylindrical portion9 are affixed to one another, by some form of adhesive for example, toprovide a unitary structure. Moreover, compensation for slightstructural deviations and tendency toward longitudinal misalignment canbe made when affixing the flared and quasi-cylindrical.portions 7 and 9to one another.

Thereafter, the ear members 25 of the first plastic member 11 arelongitudinally aligned with the notches 19 of the flared portion 7 andattachment of the plastic member 11 to the flared portion 7 is effected.Also, the spaced tabs 35 of the second plastic member 13 arelongitudinally aligned with the indentations 29 of the quasi-cylindricalportion 9 and the protuberances 31 and attachment of the plastic member13 and quasicylindrical portion 9 'is effected. Thereafter, the wireturns 15 are toroidally wrapped about the integral flared portion 7,quasi-cylindrical portion 9, first plastic member 11 and second plasticmember 13.

Thus, there has been provided an enhanced deflection yoke suitable foruse with a cathode ray tube. The yoke includes a core member having aflared portion and a quasi-cylindrical portion formed to telescope overthe neck portion of a cathode ray tube. Moreover, it is obvious that thecore member may be in the form of a plurality of circular portionsextending along the longitudinal axis and formed for attachmenttherebetween.

Also, it can be readily understood that the individual portions of thecore member are individually manufactureable which reduces the amount ofmaterial discarded when a defect is found and permits selective matchingof the flared and quasi-cylindrical portions. Also, separate manufactureof the flared and quasicylindrical portions permits attainment of arelatively thick flared portion as compared with the quasi-cylindricalportion whereby the inductance to resistance ratio is enhanced therebyreducing operating temperature for a given field strength, improvingsweep linearity, and reducing the current flow necessary to achieve adesired field strength in the area of the flared portion.

. Further, the individual portions permit utilization of the bestpressing and firing conditions for each of the portions wherebyhomogeneous densification and reduced warpage is effected. More-over,relatively large'core members can be constructed with availableapparatus whereby the need for apparatus of greatly increased magnitudeand capabilities, normally required for cores of increased size isobviated.

While there has been shown and described what is at present consideredthe preferred embodiment of the invention, it will be obvious to thoseskilled in the art that various v changes and modifications may be madetherein without departing from the scope of the invention as defined bythe appended claims.

I claim:

1. A deflection yoke for a cathode ray tube comprisa multiple-part coremember having at least one substantially circular flared portion and atleast one substantially quasi-cylindrical portion, said quasicylindricalportion affixed to the flared portion and formed to telescope over theneck portion of a cathode ray tube; and Y I horizontal and verticaldeflection windings toroidally-wound about said core member.

2. The deflection yoke of claim 1 wherein said quasicylindrical portionof said core member includes at least one protuberance extendinginwardly toward said neck portion of said cathode ray tube and saidcircular flared portion includes a notch whereby alignment of saidquasi-cylindrical portions of said yoke is effected '7 by alignment ofsaid protuberance and notch.

3. The deflection yoke of claim 1 wherein said flared portion and saidquasi-cylindrical portion each include a plurality of notches wherebyalignment therebetween is effected.

4. The deflection yoke of claim 1 wherein said flared portion and saidquasi-cylindrical portion each include a frontward edge portion and arearward edge portion with said rearward edge portion of said flaredportion in contacting relationship with said frontward edge portion ofsaid quasi-cylindrical portion.

5. The deflection yoke of claim 1 wherein said flared portion of saidcore member includes a frontward edge portion having pairs ofdiametrically opposed notches lying on the horizontal axis and on thevertical axis and said quasi-cylindrical portion of said core memberincludes a frontward edge portion having pairs of diametrically opposednotches lying on the horizontal axis and on the vertical axis and pairsof protuberances lying on the horizontal and on the vertical axes inalignment with said notches and extending inwardly toward said neckportion of said cathode ray tube.

6. he deflection yoke of claim 1 wherein said flared portion is of athickness substantially greater than the thickness of saidquasi-cylindrical portion and formed for contact with saidtoroidally-wound horizontal and vertical deflection windings whereby animproved inductance to resistance ratio is obtained.

7. A cathode ray tube deflection yoke comprising: a pair of horizontaland pair of vertical deflection windings; v

a multiple-part core member toroidally wrapped with said deflectionwindings, said core member including at least one circular flaredportion and a quasicylindrical portion affixed to the flared portion andadapted to telescope over the neck portion of a cathode ray tube.

8. The deflection yoke of claim 7 wherein said flared portion is of athickness greater than said quasi-cylindrical portion.

9. The deflection yoke of claim 7 wherein said flared portion andquasi-cylindrical portion each include at least one notch wherebylongitudinal alignment therebetween is efi'ected.

10. The deflection yoke of claim 7 wherein said quasi-cylindricalportion includes a plurality of notches and a plurality of protuberancesextending inwardly toward said neck portion of said cathode ray tubewith said notches and protuberances longitudinally aligned and saidflared portion includes a notch formed for alignment with saidprotuberances and notches of said quasi-cylindrical portion.

1. A deflection yoke for a cathode ray tube comprising: a multiple-partcore member having at least one substantially circular flared portionand at least one substantially quasicylindrical portion, saidquasi-cylindrical portion affixed to the flared portion and formed totelescope over the neck portion of a cathode ray tube; and horizontaland vertical deflection windings toroidally-wound about said coremember.
 2. The deflection yoke of claim 1 wherein said quasi-cylindricalportion of said core member includes at least one protuberance extendinginwardly toward said neck portion of said cathode ray tube and saidcircular flared portion includes a notch whereby alignment of saidquasi-cylindrical portions of said yoke is effected by alignment of saidprotuberance and notch.
 3. The deflection yoke of claim 1 wherein saidflared portion and said quasi-cylindrical portion each include aplurality of notches whereby alignment therebetween is effected.
 4. Thedeflection yoke of claim 1 wherein said flared portion and saidquasi-cylindrical portion each include a frontward edge portion and arearward edge portion with said rearward edge portion of said flaredportion in contacting relationship with said frontward edge portion ofsaid quasi-cylindrical portion.
 5. The deflection yoke of claim 1wherein said flared portion of said core member includes a frontwardedge portion having pairs of diametrically opposed notches lying on thehorizontal axis and on the vertical axis and said quasi-cylindricalportion of said core member includes a frontward edge portion havingpairs of diametrically opposed notches lying on the horizontal axis andon the vertical axis and pairs of protuberances lying on the horizontaland on the vertical axes in alignment with said notches and extendinginwardly toward said neck portion of said cathode ray tube.
 6. Thedeflection yoke of claim 1 wherein said flared portion is of a thicknesssubstantially greater than the thickness of said quasi-cylindricalportion and formed for contact with said toroidally-wound horizontal andvertical deflection windings whereby an improved inductance toresistance ratio is obtained.
 7. A cathode ray tube deflection yokecomprising: a pair of horizontal and pair of vertical deflectionwindings; a multiple-part core member toroidally wrapped with saiddeflection windings, said core member including at least one circularflared portion and a quasi-cylindrical portion affixed to the flaredportion and adapted to telescope over the neck portion of a cathode raytube.
 8. The deflection yoke of claim 7 wherein said flared portion isof a thickness greater than said quasi-cylindrical portion.
 9. Thedeflection yoke of claim 7 wherein said flared portion andquasi-cylindrical portion each include at least one notch wherebylongitudinal alignment therebetween is effected.
 10. The deflection yokeof claim 7 wherein said quasi-cylindrical portion includes a pluralityof notches and a plurality of protuberances extending inwardly towardsaid neck portion of said cathode ray tube with said notches andprotuberances longitudinally aligned and said flared portion includes anotch formed for alignment with said protuberances and notches of saidquasi-cylindrical portion.